fastmcp

The fast, Pythonic way to build MCP servers and clients.

fastmcp Permissive license Apache-2.0 Active ★ 27,204 v3.4.7 released 2026-08-10

Install

fastmcp on PyPI

pip

pip install fastmcp

uv

uv add fastmcp

poetry

poetry add fastmcp

Package facts

License	Apache-2.0 (permissive)
Python support	supports the current Python release (>=3.10)
Install friction	low — pure-Python wheel
Runtime dependencies	1 — fastmcp-slim
Maintenance	actively maintained — 3 days since the last release
Last repo commit	2026-08-13
First released	2024-11-30
Popularity	one of the top 1,000 most-downloaded packages on PyPI (30-day window, as of 2026-08-13)
Known vulnerabilities	none known (OSV.dev, checked 2026-08-13)

Evidence: fastmcp-3.4.7-py3-none-any.whl

Keywords: agent, fastmcp, llm, mcp, mcp client, mcp server, model context protocol

Intended Audience :: DevelopersLicense :: OSI Approved :: Apache Software LicenseProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Topic :: Scientific/Engineering :: Artificial IntelligenceTyping :: Typed

About fastmcp

from the package's own PyPI description — quoted content, verbatim

FastMCP 🚀

<strong>Move fast and make things.</strong>

Made with 💙 by Prefect

Docs (image) Discord (image) [![PyPI -...

Read as markdown · JSON record · Source repository · Homepage · Docs

AI interpretation — verify before relying

AI-generated interpretation of the package facts above; every digit, version, license, or vulnerability id it cites is grounded in the facts already shown on this page

FastMCP is a Python framework for building Model Context Protocol (MCP) servers and clients that expose tools, resources, and prompts to LLMs with automatic schema generation and validation.

Low install friction with a pure-Python wheel distribution. Actively maintained with a release 3 days old; the project is in the top 1000 PyPI packages.

Licensed under Apache-2.0 (permissive), allowing commercial and private use with minimal restrictions; you must include a copy of the license and state material changes.

Usage

pip install fastmcp

from fastmcp import FastMCP

mcp = FastMCP("Demo")

@mcp.tool
def add(a: int, b: int) -> int:
    """Add two numbers"""
    return a + b

if __name__ == "__main__":
    mcp.run()

Requires Python 3.10 or later; fastmcp-slim is a runtime dependency.

Verdict: FastMCP is a well-maintained, actively developed framework with zero known vulnerabilities. Its permissive Apache-2.0 license and low install friction make it a straightforward choice for building MCP servers and clients in Python 3.10+.

Needs verification

Community adoption metrics and deployment scale across production MCP servers.
Whether fastmcp-slim's own dependency tree introduces any notable transitive friction or security concerns.
Performance characteristics or resource overhead when running multiple concurrent MCP servers.
Compatibility guarantees or breaking-change policy across minor versions.

model context protocol frameworkmcp server builder pythonllm tool exposure frameworkmcp client libraryagent tool integrationllm function wrappingmcp protocol implementation